| 摘要 |
<p>Circuitry for self-excitation of self-resonant vibrations in a mechanical vibrating system (10) comprises an electromechanical transducer system (20) arranged in the feedback circuit of an electrical amplifier circuit (30) so that mechanical vibrations are induced in the system by the output alternating voltage of the amplifier circuit (30) and the system supplies an alternating voltage having the frequency of the mechanical vibrations to the input of the amplifier circuit (30). The amplifier circuit (30) has a non-linear amplification characteristic curve, which results in greater amplification at lower values of the input signal than at higher values. This ensures reliable vibration even under unfavorable operating conditions, while reducing the risk of false indications concerning the state of vibration, for example due to foreign vibrations.</p> |
